"""modify sub_order due_time's typeRevision ID: 34726d8933e3Revises: d424258bb9cCreate Date: 2013-06-04 16:19:07.402000"""# revision identifiers, used by Alembic.revision = '34726d8933e3'down_revision = 'd424258bb9c'from alembic import opimport sqlalchemy as sadef upgrade():    op.alter_column("TB_SUB_ORDER", "due_time", type_=sa.Date)def downgrade():    op.alter_column("TB_SUB_ORDER", "due_time", type_=sa.DateTime)